package com.commons;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class SetCharacterEncodingFilter implements Filter {
    protected String encoding = null;
    protected FilterConfig filterConfig = null;
    protected boolean ignore = true;
    
	public void destroy() {
		this.encoding = null;
		this.filterConfig = null;
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
	    if(ignore||(request.getCharacterEncoding()==null)){
	    	String encoding = selectEncoding(request);
	    	if(encoding != null)
	    		request.setCharacterEncoding(encoding);
	    }
	    chain.doFilter(request, response);

	}
	
	public String selectEncoding(ServletRequest request){
		return(this.encoding);
	}

	public void init(FilterConfig filterConfig) throws ServletException {
         this.filterConfig = filterConfig;
         this.encoding = filterConfig.getInitParameter("encoding");
         String value = filterConfig.getInitParameter("ignore");
         if(value == null || value.equalsIgnoreCase("true") || value.equalsIgnoreCase("yes"))
        	 this.ignore = true;
         else 
        	 this.ignore = false;
	}
}
